Synthesis and electrochemical studies of NaCoPO4 as an efficient cathode material using natural deep eutectic solvents for aqueous rechargeable sodium-ion batteries oleh C. V. V. Eswara Rao, Sannapaneni Janardan, H. Manjunatha, K. Venkata Ratnam, Sandeesh Kumar, K. Chandrababu Naidu, Shivendu Ranjan